<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <login></login>
    </div>

    <script>

        var login = {
            template: '<h1>1234</h1>'
        }
        //Vue.component('mylogin', login);

        var vm = new Vue({
            el: '#app',
            data: {

            },
            methods: {

            },
            components: {
                login
            }
        });
    </script>
</body>
</html>